code: def _setup_context(self, num_gpus=2):
      context._reset_context()
      gpus = config.list_physical_devices("GPU")
      if len(gpus) < num_gpus:
          self.skipTest(
              "Expected at least {} GPUs but found {} GPUs".format(
                  num_gpus, len(gpus)
              )
          )
      context.ensure_initialized()
  
imports: import os
  import threading
  import time
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import config
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import collective_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the CollectiveOpGPUTest obj's underlying member method code with example usage: obj._setup_context(num_gpus) without return types